Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
The _ga cookie, installed by Google Analytics, calculates visitor, session and campaign data and also keeps track of site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognize unique visitors.
When visitors comment on your blog, they too get cookies stored on their computer. This is purely a convenience, so that the visitor won’t need to re-type all their information again when they want to leave another comment